# US 11,310,671 B2 · Resource unit notching for incumbent protection in the 6GHZ band for next-generation Wi-Fi

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- Number: US 11,310,671 B2
- Document ID: US11310671B2
- Status: Granted
- Kind: B2
- Application number: 16/646,319
- Filed: 2017-12-20
- Published: 2021-11-25
- Granted: 2022-04-19
- Earliest claimed: 2017-12-20
- Assignees: Intel Corporation
- Applicants: Intel Corporation
- Inventors: Laurent Cariou; Xiaogang Chen; Feng Jiang; Qinghua Li
- Web page: https://patentgrep.com/patent/US11310671B2

## CPC

- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04B 7/0413: MIMO systems
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

Methods, apparatus, and computer-readable media are described for notching a 6 GHz channel. A station associates with an access point on a 6 GHz band. A notching pattern indication is decoded from data received from the AP after associating with the AP. A notching region within a channel within the 6 GHz band is determined based on the notching pattern indication. The notching pattern indicates a width of a notching region and a location of the notching region within the channel. The notching region covers bandwidth occupied by an incumbent system within the channel. A physical layer convergence procedure (PLCP) protocol data unit (PPDU) is encoded for transmission on the channel to the AP. The PPDU is encoded to exclude transmission within the notching region.

## Claims

### Claim 1

An apparatus of an access point (AP) configurable for unlicensed operation in a 6 Gigahertz (GHz) band, the apparatus comprising:
memory; and
processing circuitry, the processing circuitry configured to:
generate a physical layer convergence procedure (PLCP) protocol data unit (PPM) to include a signalling field encoded to indicate a notching pattern, the notching pattern comprising four bits, each bit corresponding to one of a plurality of 20 MHz channels in an 80 MHz portion of the PPDU, the PPDU being one of an 80 MHz PPDU, a 160 MHz PPDU and a 320 MHz PPDU;
wherein the notching pattern indicates which one or more of the 20 MHz channels in the 80 MHz portion are notched, and
encode the PPDU for transmission in the 6 GHz band, wherein transmitted signal levels within the one or more of the 20 MHz channels to be notched are lowered to reduce interference.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the one or more of the 20 MHz channels to be notched correspond to incumbent system operation in the 6 GHz band, and
wherein the transmitted signal levels within the one or more of the 20 MHz channels to be notched are lowered to reduce interference with the incumbent system operation.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the processing circuitry further encodes the signalling field to indicate a relevant 80 MHz portion of the PPDU that the notching pattern is applied to.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein the signalling field that indicates the notching pattern is encoded as part of a physical layer of the PPDU.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein processing circuitry is configured to use orthogonal frequency division multiple access (OFDMA) for transmission of the PPDU.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein an 80 MHz PPDU has a transmission bandwidth of 80 MHz, a 160 MHz PPDU has a transmission bandwidth of 160 MHz, and a 320 MHz PPDU has a transmission bandwidth of 320 MHz, and
wherein after encoding the PPDU for transmission, the processing circuitry is to configure the AP to apply a transmit filter to reduce signal levels of the one or more of the 20 MHz channels to be notched, the one or more 20 MHz channels to be notched being with the transmission bandwidth of the PPDU.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the memory is configured to store the notching pattern.

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein the processing circuitry includes a baseband processor.

### Claim 9

A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of an access point (AP) configurable for unlicensed operation in a 6 Gigahertz (GHz) band, the processing circuitry configured to:
generate a physical layer convergence procedure (PLCP) protocol data unit (PPDU) to include a signalling field encoded to indicate a notching pattern, the notching pattern comprising four bits, each bit corresponding to one of a plurality of 20 MHz channels in an 80 MHz portion of the PPDU, the PPDU being one of an 80 MHz PPDU, a 160 MHz PPDU and a 320 MHz PPDU;
wherein the notching pattern indicates which one or more of the 20 MHz channels in the 80 MHz portion are notched, and
encode the PPDU for transmission in the 6 GHz band, wherein transmitted signal levels within the one or more of the 20 MHz channels to be notched are lowered to reduce interference.

### Claim 10 (depends on 9)

The non-transitory computer-readable storage medium of claim 9, wherein the one or more of the 20 MHz channels to be notched correspond to incumbent system operation in the 6 GHz band, and
wherein the transmitted signal levels within the one or more of the 20 MHz channels to be notched are lowered to reduce interference with the incumbent system operation.

### Claim 11 (depends on 10)

The non-transitory computer-readable storage medium of claim 10, wherein the processing circuitry further encodes the signalling field to indicate a relevant 80 MHz portion of the PPDU that the notching pattern is applied to.

### Claim 12 (depends on 5)

The non-transitory computer-readable storage medium of claim 5, wherein the signalling field that indicates the notching pattern is encoded as part of a physical layer of the PPDU.

### Claim 13 (depends on 12)

The non-transitory computer-readable storage medium of claim 12, wherein processing circuitry is configured to use orthogonal frequency division multiple access (OFDMA) for transmission of the PPDU.

### Claim 14 (depends on 13)

The non-transitory computer-readable storage medium of claim 13, wherein an 80 MHz PPDU has a transmission bandwidth of 80 MHz, a 160 MHz PPDU has a transmission bandwidth of 160 MHz, and a 320 MHz PPDU has a transmission bandwidth of 320 MHz, and
wherein after encoding the PPDU for transmission, the processing circuitry is to configure the AP to apply a transmit filter to reduce signal levels of the one or more of the 20 MHz channels to be notched, the one or more 20 MHz channels to be notched being with the transmission bandwidth of the PPDU.

### Claim 15

An apparatus of non-access point (AP) station (STA) configurable for unlicensed operation in a 6 Gigahertz (GHz) band, the apparatus comprising:
memory; and
processing circuitry, the processing circuitry configured to:
decode a physical layer convergence procedure (PUT) protocol data unit (PPDU) that includes a signalling field indicating a notching pattern, the notching pattern comprising four bits, each bit corresponding to one of a plurality of 20 MHz channels in an 80 MHz portion of the PPDU, the PPDU being one of an 80 MHz PPDU, a 160 MHz PPDU and a 320 MHz PPDU,
wherein the notching pattern indicates which one or more of the 20 MHz channels in the 80 MHz portion are notched,
wherein the PPDU is received from an AP in the 6 GHz hand, and
wherein signal levels within the one or more of the 20 MHz channels that are indicated as being notched are lowered to reduce interference.

### Claim 16 (depends on 15)

The apparatus of claim 15, wherein the one or more of the 20 MHz channels that are notched correspond to incumbent system operation in the 6 GHz band, and
wherein the received signal levels within the one or more of the 20 MHz channels that are notched are lowered to reduce interference with the incumbent system operation.

### Claim 17 (depends on 16)

The apparatus of claim 16, wherein the processing circuitry is further configured to decode the signalling field to determine a relevant 80 MHz portion of the PPDU that the notching pattern has been applied to.

### Claim 18 (depends on 17)

The apparatus of claim 17, wherein the signalling field that indicates the notching pattern is part of a physical layer of the PPDU.

### Claim 19 (depends on 18)

The apparatus of claim 18, wherein the PPDU is transmitted using orthogonal frequency division multiple access (OFDMA).

### Claim 20 (depends on 19)

The apparatus of claim 19, wherein an 80 MHz PPDU has a transmission bandwidth of 80 MHz, a 160 MHz PPDU has a transmission bandwidth of 160 MHz, and a 320 MHz PPDU has a transmission bandwidth of 320 MHz, and
wherein the processing circuitry is configured to refrain from decoding the one or more of the 20 MHz channels to be notched, the one or more 20 MHz channels to be notched being with the transmission bandwidth of the PPDU.

### Claim 21 (depends on 20)

The apparatus of claim 20, wherein the memory is configured to store the notching pattern.

### Claim 22 (depends on 21)

The apparatus of claim 21, wherein the processing circuitry includes a baseband processor.